Tue Jun 23 18:04:44 2020
<9e126bf3> <https://www.cell.com/cell/fulltext/S0092-8674(20)30610-3>
<9e126bf3> > Importantly, we detected SARS-CoV-2-reactive CD4+ T cells in ∼40%–60% of unexposed individuals, suggesting cross-reactive T cell recognition between circulating “common cold” coronaviruses and SARS-CoV-2.
<9e126bf3> if you have had a cold semi-recently, you probably already have decent immunity to covid